The stockwell incident for example ended with probable use of "excessive force", but, the guy ran from armed officers, you have to accept culpability...if you run from armed police officers, you're probably going to get shot.
I don't believe there is any credible evidence that the victim of the Stockwell incident ever ran from armed police. Everything I've seen says he had no idea there were any armed police anywhere near him until they dragged him off the train and shot him in the head. It is highly likely he didn't have a clue what was going on.